yes. it is. noticed that when you turn the heat on, it cools down some. some guy at pep boys says it "sounds" like warped heads
... but he didn't check. i think we're gonna run a pressure test and see if there is a leak. i haven't noticed any coolant/water on the ground... or coming out of the tail pipe. my mother has a 96 lumina, and when she blew the head gasket, it was spitting water out the tailpipe.